论文标题
在大范围准级a-bi $ _4 $ br $ _4 $中观察拓扑起源的边缘状态
Observation of the Topologically Originated Edge States in large-gap Quasi-One-Dimensional a-Bi$_4$Br$_4$
论文作者
论文摘要
二维拓扑绝缘子具有带有线性能量分散剂的时间反向不变的自旋摩托杆锁的一维边缘状态。但是，对1D边缘状态的实验访问仍然是巨大的挑战，并且仅限于迄今为止很少的技术。在这里，通过使用红外吸收光谱，我们在A-BI4BR4皮带中观察到了稳健的拓扑来源的边缘状态，并具有明确的标志，并在皮带侧面具有强烈的红外吸收和相对于光偏振的明显各向异性，这进一步由第一原则计算。我们的工作首次证明，红外光谱可以在实验探测拓扑材料的1D边缘状态下提供有效的方法。
Two-dimensional topological insulator features time-reversal-invariant spin-momentum-locked one-dimensional (1D) edge states with a linear energy dispersion. However, experimental access to 1D edge states is still of great challenge and only limited to few techniques to date. Here, by using infrared absorption spectroscopy, we observed robust topologically originated edge states in a-Bi4Br4 belts with definitive signature of strong infrared absorption at belt sides and distinct anisotropy with respect to light polarizations, which is further supported by first-principles calculations. Our work demonstrates for the first time that the infrared spectroscopy can offer a power-efficient approach in experimentally probing 1D edge states of topological materials.
